Western Australia's largest disability services provider is centralising the majority of its supported employment sites in Perth, but insists no-one will lose their job and the level of individual support will not be diminished.

Key points:

Four supported employment sites for workers with disabilities to close

Activ Foundation to centralise work at Bentley warehouse

Activ calls for quick agreement for National Disability Insurance Scheme

The Activ Foundation started informing families and supported employees, which it also calls "customers", about the change early last month.

Four of its workshops around Perth will be closed and all services and work brought to its renovated warehouse site in Bentley, where up to 350 people with disabilities will work by August next year.

Some workers had expressed concern at the shutdown, however, Activ Foundation chief executive officer Danielle Newport said all supported employees would have a place at Bentley.

"There's no loss of employment opportunities," Ms Newport said.

"In fact we think it's going to offer new choices, new opportunities."

Ms Newport she was adamant the support individual workers required would not be reduced.

"I don't think the fact there are more people in a location means that their supports will be any less individual. We are very focused on what the individual needs," she said.

Single workshop set to save costs

There is expected to be a financial benefit for the not-for-profit organisation, with cost savings from operating fewer sites.

"We need to be able to be competitive or we won't be able to provide work," Ms Newport said.

Employees at the workshops package headsets and cutlery for airlines, re-package large imports of food and other goods into smaller parcels for distribution to stores and pack showbags for the Perth Royal Show, among other jobs.

Workers are paid on the federal supported wage system for people with a reduced work capacity because they have a disability.

During a three-month trial, their work capacity is assessed and they are then paid a percentage of the minimum wage.

Under the Fair Work Act, the minimum anyone can be paid per week under this system is $82, although Ms Newport said some of Activ's supported employees were paid 100 per cent of the minimum wage.

Call for clarity over future funding

The Activ Foundation receives federal funding to provide the support people need to work, with the arrangement to be folded into the National Disability Insurance Scheme when it is introduced.

Ms Newport urged the state and federal governments to quickly conclude their agreement for the scheme, to provide clarity for future service provision.

WA is currently trialling two versions of the scheme — the Commonwealth's NDIS in the Perth hills, and the State Government's My Way trial in the South West and Perth's south.

Disability Services Minister Donna Farragher's office is expecting an announcement later this month on which model will be adopted in WA.